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Finding the Fourth Proportional to 15,939, 21,995.37 and 8,865.66

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Solution

The fourth proportional to 15,939, 21,995.37 and 8,865.66 is: 12,234.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,939 : 21,995.37 = 8,865.66 : x
  2. Step 2: Convert to fraction form
    15,939/21,995.37 = 8,865.66/x
  3. Step 3: Cross multiply
    15,939x = 21,995.37 × 8,865.66
  4. Step 4: Simplify right side
    15,939x = 195,003,471.99
  5. Step 5: Solve for x
    x = 195,003,471.99/15,939
  6. Step 6: Final answer
    x = 12,234.36

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.